B.A. Psychology stands for Bachelors of Arts in Psychology. This type of degree focuses on liberal arts much more than science in psychology. Students who enroll in this are taught minor courses in psychology, study humanities, social sciences, and maybe foreign languages. This degree is suited for students who wish to have a career in the psychology field. B.S.
Psychology stands for Bachelors of Science in Psychology. This focuses more on research, science subjects, and statistics. Students learn how to connect psychology concepts to empirical research. This degree can common among students who plan to further in medical school.
BA Psychology means Bachelor of Arts in Psychology while BS Psychology means Bachelor of Science in Psychology. The main difference between the two is the type of subjects that will be taught to students who are trying to get their degrees. Those who study BA Psychology would learn more about the minor subjects that are related to Psychology and Psychology perse.
Those who study BS Psychology will have more science subjects. It is also possible that BS Psychology students can enroll in medical school because they have already gotten some of the science subjects that are needed to be given a slot in medical school among all the other requirements available.